All-perovskite tandem solar cells with improved grain surface passivation

Lin, Renxing; Xu, Jian; Wei, Mingyang; Wang, Yurui; Qin, Zhengyuan; Liu, Zhou; Wu, Jinlong; Xiao, Ke; Chen, Bin; Park, So Min; Chen, Gang; Atapattu, Harindi R.; Graham, Kenneth R.; Xu, Jun; Zhu, Jia; Li, Ludong; Zhang, Chunfeng; Sargent, Edward H.; Tan, Hairen

doi:10.1038/s41586-021-04372-8

Title: All-perovskite tandem solar cells with improved grain surface passivation

Journal Article · Mon Jan 17 00:00:00 EST 2022 · Nature (London)

DOI:https://doi.org/10.1038/s41586-021-04372-8· OSTI ID:2204711

Lin, Renxing ^[1]; Xu, Jian ^[2];

^[2]; Wang, Yurui ^[1]; Qin, Zhengyuan ^[1]; Liu, Zhou ^[1]; Wu, Jinlong ^[1]; Xiao, Ke ^[1];

^[2]; Park, So Min ^[2];

^[3]; Atapattu, Harindi R. ^[4]; Graham, Kenneth R. ^[4]; Xu, Jun ^[1];

^[1]; Li, Ludong ^[1];

^[1];

^[2];

^[1]

Nanjing University (China)
University of Toronto, ON (Canada)
Shanghai Tech University (China)
University of Kentucky, Lexington, KY (United States)

All-perovskite tandem solar cells hold the promise of surpassing the efficiency limits of single-junction solar cells; however, until now, the best-performing all-perovskite tandem solar cells have exhibited lower certified efficiency than have single-junction perovskite solar cells. A thick mixed Pb–Sn narrow-bandgap subcell is needed to achieve high photocurrent density in tandem solar cells, yet this is challenging owing to the short carrier diffusion length within Pb–Sn perovskites. Here we develop ammonium-cation-passivated Pb–Sn perovskites with long diffusion lengths, enabling subcells that have an absorber thickness of approximately 1.2 μm. Molecular dynamics simulations indicate that widely used phenethylammonium cations are only partially adsorbed on the surface defective sites at perovskite crystallization temperatures. The passivator adsorption is predicted to be enhanced using 4-trifluoromethyl-phenylammonium (CF3-PA), which exhibits a stronger perovskite surface-passivator interaction than does phenethylammonium. By adding a small amount of CF3-PA into the precursor solution, we increase the carrier diffusion length within Pb–Sn perovskites twofold, to over 5 μm, and increase the efficiency of Pb–Sn perovskite solar cells to over 22%. Here, we report a certified efficiency of 26.4% in all-perovskite tandem solar cells, which exceeds that of the best-performing single-junction perovskite solar cells. Encapsulated tandem devices retain more than 90% of their initial performance after 600 h of operation at the maximum power point under 1 Sun illumination in ambient conditions.

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Research Organization:: Univ. of Kentucky, Lexington, KY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Jiangsu Province; US Department of the Navy, Office of Naval Research

Grant/Contract Number:: SC0018208; 2018YFB1500102; 61974063; 61921005; BK20202008; BK20190315; N00014-20-1-2572

OSTI ID:: 2204711

Journal Information:: Nature (London), Vol. 603, Issue 7899; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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